Cambridge professor Stefan Halper expressed skepticism of the alleged collusion between Russia and the Trump campaign in communications with Carter Page.

It was recently revealed Halper was the alleged FBI informant who spied on Page and George Papadopoulos, another Trump campaign aide.

Halper and Page’s 14 months of contact ended in September 2017, the same month the last FISA warrant against the former Trump campaign aide expired.

Last July, Cambridge professor Stefan Halper contacted Carter Page with something resembling support for the Trump campaign aide, who has faced allegations that he is a Russian agent and a conduit for collusion between the Kremlin and the campaign.

“It seems attention has shifted a bit from the ‘collusion’ investigation to the ‘contretempts’ [sic] within the White House,” Halper wrote in a July 28, 2017 email to Page.

“I must assume this gives you some relief,” he continued, signing off with “be in touch when you have the time. Would be great to catch up.”

The email provides some insight into how Halper might have gained Page’s trust. And it was that trust that the 73-year-old Halper seemingly used while working as an FBI informant to keep tabs on Page.

That email was not the only time Halper, a foreign policy expert with links to the CIA and MI6, offered apparent skepticism at the collusion allegations against Page, a Naval Academy graduate and energy consultant.

But Halper was all but identified on Friday as an FBI informant who spied on Page and George Papadopoulos, another Trump campaign adviser. Halper also made contact in August 2016 with Sam Clovis, the campaign’s national co-chairman.

In news articles published Friday, The Washington Post and The New York Times described an informant who met several times with Page and Papadopoulos.

The newspapers did not name the informant, but the details matched up exactly with two DCNF reports, one published in March and the other on May 17. The Times and WaPo said they were not printing the informant’s names upon the request of the intelligence community. The FBI, the Department of Justice and the CIA have all declined TheDCNF’s request for guidance or comment about Halper.

Page and Halper first met at an election-themed symposium held at Cambridge on July 11 and 12, 2016, several days after Page’s now-infamous speech at the New Economic School in Moscow.

Halper approached Page on the sidelines of the event, and the pair struck up what Page thought to be a friendship. Page told TheDCNF that he stayed in touch with Halper for 14 months, through September 2017.

Page noted that in their first conversation at Cambridge, Halper said he was longtime friends with then-campaign chairman Paul Manafort. A person close to Manafort told TheDCNF that Manafort has not seen Halper since the Gerald Ford administration. Manafort and Page are accused in the Steele dossier of having worked together on the campaign’s collusion conspiracy, but both men say they have never met.

The FBI and the Justice Department relied heavily on the unverified dossier to obtain Foreign Intelligence Surveillance Act warrants against Page. The first surveillance warrant was granted on Oct. 21, 2016. They were renewed in January, early April and late June 2017.

To obtain a FISA, the government is required to show that there is probable cause to show that a target is acting as an agent of a foreign power. To get renewals, the government must provide new information supporting that probable cause claim. It’s unknown whether information Halper collected on Page was included in the FISA renewal applications.

The fourth and final spy warrant against Page expired in Sept. 2017, the same month Page and Halper fell out of contact.

Halper’s outreach to two other Trump campaign advisers had mixed results in terms of raising skepticism from the targets.

Clovis, who made the final decision in March 2016 to bring both Page and Papadopoulos onto the campaign, had no inclination that Halper was spying on Trump associates. Clovis and Halper met for coffee on Aug. 31 or Sept. 1, 2016 near Washington. Clovis said the conversation was innocuous, focusing mostly on foreign policy issues, including China, one of Halper’s areas of expertise.

Halper and Clovis did not meet again, though Halper sent the Trump official a note of congratulations after Donald Trump’s presidential election win.

While Clovis detected nothing nefarious from Halper, Papadopoulos was alerted during one of his meetings with the professor in mid-Sept. 2016.

As TheDCNF reported in March, Halper reached out to Papadopoulos on Sept. 2, 2016 to offer to pay him for a policy paper about energy issues in Turkey, Israel and Cyprus. Halper paid for Papadopoulos’s flight and several nights in London. The pair met several times during Papadopoulos’ stay, including for dinner at the Travellers Club, an Old London gentlemen’s club frequented by diplomats and spies.

Halper was accompanied by an assistant, a Turkish woman named Azra Turk.

During one of their dinners, Halper asked Papadopoulos whether he was involved in the Russian theft of Democrats’ emails, sources familiar with Papadopoulos’ account have told TheDCNF. Papadopoulos denied the allegation, saying that stealing emails would be treason.

Halper grew frustrated, according to sources.

Papadopoulos had been told about Russians and the emails earlier in the campaign. During an April 26, 2016 meeting, another professor named Joseph Mifsud told the Trump aide that he had learned that Russians had obtained “thousands” of emails related to Hillary Clinton.

And an Australian diplomat named Alexander Downer reportedly said Papadopoulos discussed hacked Clinton emails during a barroom discussion in London around May 10, 2016. Downer relayed that information to his countrymen, who shared it with the FBI. That information is allegedly what prompted the bureau on July 31, 2016 to open its counterintelligence investigation of the Trump campaign, nicknamed “Crossfire Hurricane.”

The FBI has said that Papadopoulos was the catalyst for the probe, but Halper interacted with Page two weeks before Crossfire Hurricane started.

Papadopoulos has pleaded guilty to lying to the FBI about the timing of his encounters with Mifsud and two Russian nationals. He did, however, tell the FBI in his initial interviews that Mifsud mentioned Clinton documents.

Turk, Halper’s assistant, also brought up the topic of the emails during a one-on-one interaction with Papadopoulos. She later attempted to meet with Papadopoulos in Chicago, where he lives.

Papadopoulos wrote the energy policy paper after returning to the U.S. and received a $3,000 wire transfer from Halper.

Papadopoulos has told people around him that he was skeptical of Halper’s inquiries. TheDCNF has not learned whether Papadopoulos was suspicious of the encounters at the time or whether that suspicion developed later on.

Halper has longstanding ties to the CIA and MI6, the British intelligence service. Halper’s father-in-law was CIA legend Ray Cline, and he is currently a partner at the Cambridge Security Initiative with Sir Richard Dearlove, the former MI6 chief.

Dearlove reportedly met with Christopher Steele, the author of the dossier, in September 2016 to discuss how to investigate possible ties between the Trump campaign and the Russian government.

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